we ran the catalyst composits on all 3 bikes this year with no issues. the fit was very good and took very little prep for the paint. i would however go ahead and pay the extra $15 and have them install the dzeus fasteners for you. you cant even buy them that cheap. the set that is on .rj's sv was lowsided at shenandoah and held up great. the set that is on the 600 (for sale at ffx cycles if you want to see it) was purchased used and while i would have drilled the holes in different places it still worked great all season.